Air Vents for Steam Systems FMAV
Air in your steam system is a hidden efficiency killer. Dissolved air in feedwater, or air trapped during startup, leads to slow heating, equipment corrosion, inconsistent batch times, and steam trap air-locking.
The Forbes Marshall Air Vent (FMAV) is a solution consisting of a balanced pressure thermostatic steam trap assembly specifically engineered to aggressively and effectively vent trapped air from steam mainlines and process equipment. It is installed at the highest point of the equipment, ensuring rapid system heating and maintains optimal steam temperatures.
Key Technical Specifications:
- Maximum Operating Pressure (PMO): 32 bar g.
- Maximum Operating Temperature (TMO): 287°C.
- Sizes and Connections: DN15 Screwed BSPT.
- Thermometer Range: 0-200°C or 0-250°C
Related Content:
- Fully automatic operation
- Compact and easy to install
- Robust and rugged design ensures maintenance-free operation.
Frequently Asked Questions
Where should the FMAV53-D air vent be installed?
It should be installed vertically at the highest point in the equipment where air is most likely to collect.

